Primes p with digit sums s(p) and s(s(p)) also prime, but s(s(s(p))) not prime.
A213354
Primes p with digit sums s(p) and s(s(p)) also prime, but s(s(s(p))) not prime.
Terms
- a(0) =59899999a(1) =69899899a(2) =69899989a(3) =69979999a(4) =69997999a(5) =69999799a(6) =77899999a(7) =78997999a(8) =78998989a(9) =78999889a(10) =78999979a(11) =79699999a(12) =79879999a(13) =79889899a(14) =79979899a(15) =79979989a(16) =79988899a(17) =79989979a(18) =79996999a(19) =79997899a(20) =79997989a(21) =79999789a(22) =79999879a(23) =79999987
External references
- oeis: A213354